DocumentCode
1509487
Title
Enhanced magnetization and cation distributions in nanocrystalline ZnFe2O4: a conversion electron Mossbauer spectroscopic investigation
Author
Clark, Ted M. ; Evans, B.J.
Author_Institution
Dept. of Chem., Michigan Univ., Ann Arbor, MI, USA
Volume
33
Issue
5
fYear
1997
fDate
9/1/1997 12:00:00 AM
Firstpage
3745
Lastpage
3747
Abstract
The synthesis of nanocrystalline zinc ferrite (ZnFe2O 4) has been accomplished by a variety of chemical and mechanochemical techniques. An enhanced magnetization, 4-5 times that of bulk zinc ferrite, is observed for the nanoparticles regardless of the synthesis method. The hypothesis that the enhanced magnetization is due to partially inverted nanocrystalline zinc ferrite has been examined by transmission 57Fe Mossbauer spectroscopy (TMS), conversion X-ray Mossbauer spectroscopy (CXMS) and conversion electron Mossbauer spectroscopy (CEMS). Both TMS and CXMS data indicate differences in local structure between bulk and nanocrystalline samples, however they do not suggest that the samples are partially inverted. CEMS data are similar for both bulk and nanocrystalline samples, indicating similar cation distributions near the surface of nanocrystalline and bulk particles
Keywords
Mossbauer effect; conversion electron spectra; crystal chemistry; crystal structure; ferrites; magnetic particles; magnetisation; nanostructured materials; particle size; zinc compounds; ZnFe2O4; bulk particles; bulk samples; cation distributions; chemical techniques; conversion X-ray Mossbauer spectroscopy; conversion electron Mossbauer spectroscopic investigation; conversion electron Mossbauer spectroscopy; enhanced magnetization; local structure; mechanochemical techniques; nanocrystalline ZnFe2O4; nanocrystalline zinc ferrite; surface; synthesis; transmission 57Fe Mossbauer spectroscopy; Annealing; Chemicals; Electrons; Ferrites; Magnetic properties; Magnetization; Nanoparticles; Spectroscopy; X-ray diffraction; Zinc;
fLanguage
English
Journal_Title
Magnetics, IEEE Transactions on
Publisher
ieee
ISSN
0018-9464
Type
jour
DOI
10.1109/20.619558
Filename
619558
Link To Document